Complete version of ImmersiveMode.java

ImmersiveMode.java

package com.<appName>;

import android.os.Handler;
import android.view.View;

import com.facebook.react.bridge.ReactApplicationContext;
import com.facebook.react.bridge.ReactContextBaseJavaModule;
import com.facebook.react.bridge.ReactMethod;

public class ImmersiveMode extends ReactContextBaseJavaModule {
    Handler uiHandler;

    @Override
    public String getName() {
        return "ImmersiveMode";
    }

    public ImmersiveMode(ReactApplicationContext reactContext) {
        super(reactContext);
        this.uiHandler = new Handler(reactContext.getMainLooper());
    }

    /* React Methods */
    @ReactMethod
    public void enterLeanBackMode() {
        uiHandler.post(runnableEnterLeanBackMode);
    }

    @ReactMethod
    public void enterImmersiveMode() {
        uiHandler.post(runnableEnterImmersiveMode);
    }

    @ReactMethod
    public void enterStickyImmersiveMode() {
        uiHandler.post(runnableEnterStickyImmersiveMode);
    }

    @ReactMethod
    public void exitImmersiveMode() {
        uiHandler.post(runnableExitImmersiveMode);
    }


    /* System UI Methods */
    private Runnable runnableEnterLeanBackMode = new Runnable(){
        @Override
        public void run() {
            setSystemUIFlags(
                View.SYSTEM_UI_FLAG_FULLSCREEN
                | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
            );
        }
    };

    private Runnable runnableEnterImmersiveMode = new Runnable(){
        @Override
        public void run() {
            setSystemUIFlags(
                View.SYSTEM_UI_FLAG_IMMERSIVE
                | View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
                | View.SYSTEM_UI_FLAG_FULLSCREEN
            );
        }
    };

    private Runnable runnableEnterStickyImmersiveMode = new Runnable(){
        @Override
        public void run() {
            setSystemUIFlags(
                View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
                | View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
                | View.SYSTEM_UI_FLAG_FULLSCREEN
            );
        }
    };

    private Runnable runnableExitImmersiveMode = new Runnable(){
        @Override
        public void run() {
            setSystemUIFlags(
                View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
            );
        }
    };


    /* Private Methods */
    private void setSystemUIFlags(int visibility) {
        View decorView = getCurrentActivity().getWindow().getDecorView();
        decorView.setSystemUiVisibility(visibility);
    }

}